Design and Experimental Study of Dual-spool Incremental High-water-based Digital Valve
The straightness control of the scraper conveyor is a key technology for achieving intelligent coal mining.However,the discontinuity of the on-off hydraulic support electro-hydraulic valve in the underground working face makes it difficult to meet the requirements of adaptive straightness control in the integrated mining work surface.In addition,the proportional valve employing an oil medium cannot be directly applied to the hydraulic support system that adopts emulsion as the medium.In view of these problems,a novel incremental high-water-based digital valve with a dual spool is proposed,primarily comprising a valve block,dual valve core components,and a motor screw drive element.Firstly,the structure and operation of the dual-core incremental digital valve are investigated.It operates in both open-loop and closed-loop modes and separ-ately regulates the load port due to its unique double-core arrangement.Secondly,the critical sealing coupling at the valve core and seat is modeled.When matching"hard-to-soft"materials,considering sealing specific pressure and sealing contact width comprehensively,it is proven that the valve seat's half-cone angle should be 0.61 rad to achieve optimal performance in terms of sealing performance and the service life of the sealing pair.A simulation of the electro-mechanical converter is conducted using sliding mode control,and the simulation results indicate that the sliding mode control algorithm stably follows the reference signal in 0.08 s,performing significantly better in response performance than PID.Fi-nally,the xPC Target real-time control platform is created for prototype testing to verify the sealing pair's effectiveness and operational perform-ance under various motor subdivisions.The experimental analysis demonstrates that,under 21 MPa,the seal is completely sealed.The subdivi-sion control performance at 1 600 pulses per rotation is optimal.During the 0.2 mm step response,the flow rate reaches 13 L/min with a response time of 0.25 s and a steady-state fault of 3 μm,which performs well.
hydraulic supporthigh water-basedincremental digital valvesliding mode controlsubdivision control
万方数据
